Defrosting Control for a Warehouse Refrigeration System

• Main Authors: H-T Huw, 胡鴻才
• Other Authors: Yu-chuen Yeh
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/41287297633383354273

碩士 === 元智大學 === 工業工程研究所 === 87 === Defrosting Control for a Warehouse Refrigeration System Student : H-T Huw Advisor : Dr. Yu —Chuen Yeh ABSTRACT Frost layer less than0.5mm will help the heat transfe r of evaporator in the warehouse refrigeration system. However, if the frost layer is too thick, it could become a heat insulator which will reduce the heat exchange and refrigeration efficiency. If the frost formation is not properly controlled and continues to grow, the fan could be stuck by the frost or ice and fail to spin. It will cause overloading or burning of fan motor, as a result, the refrigeration system will be completely failure. A proper selection of defrosting method and precise control of defrost cycle will significantly help the warehouse refrigeration efficiency and energy saving. Using a temperature sensor to monitor the frost layer thickness, a pressure sensor at the low pressure end of compressor to monitor the frost growth, a remote PC BASED data acquisition system, PC network, and a graphical user interface PID and control system, this study is to develop a 3-phase SCR driver control system to closely control the defrosting, with an objective of saving energy and improving warehouse refrigeration efficiency. Key Word : PID、SCR、 PC BASED、Refrigeration。